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Method and system for treating load type palladium-contained dead catalyst

A waste catalyst and supported technology, which is applied in the chemical industry, can solve the problems of difficult filtration, palladium entry, and inapplicability of waste catalysts, so as to improve the use efficiency, reduce the treatment cost, and achieve the effect of reduction

Active Publication Date: 2015-10-21
HOOTECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the process is simple and non-polluting, it has the disadvantages that a small amount of palladium enters the water immersion solution and is difficult to filter, and it is difficult for α-Al 2 o 3 or α-Al 2 o 3 / SiO 2 Supported spent catalysts are not applicable

Method used

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  • Method and system for treating load type palladium-contained dead catalyst
  • Method and system for treating load type palladium-contained dead catalyst
  • Method and system for treating load type palladium-contained dead catalyst

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specific Embodiment

[0043] In one aspect of the present invention, the present invention provides a method for treating supported palladium-containing spent catalyst. According to an embodiment of the present invention, the carrier of the supported spent catalyst can be α-Al 2 o 3 or SiO 2 -α-Al 2 o 3 , it should be noted that SiO 2 -α-Al 2 o 3 Can be understood as containing SiO 2 and α-Al 2 o 3 mixture. Refer below Figure 1-2 The method for treating the supported palladium-containing spent catalyst according to the embodiment of the present invention is described in detail. According to a specific embodiment of the invention, the method includes:

[0044] S100: Roasting the spent palladium-containing catalyst

[0045] According to the embodiment of the present invention, the spent catalyst containing palladium is roasted, so that the carbon deposits and organic matter in the spent catalyst can be effectively removed.

[0046] According to the embodiment of the present invention, ...

Embodiment 2

[0092] Embodiment 2 (the inventive method)

[0093] The spent supported palladium-containing spent catalyst (the carrier is SiO 2 -α-Al 2 o 3 ) was roasted at 600° C. for 3 hours under the condition of dust collection and tail gas absorption, then got 1500 grams of spent catalyst (containing palladium 0.27wt%) after roasting, and divided into 3 parts, each part of 500 grams, numbered respectively as 1#, 2#, 3#, under the condition of negative pressure and tail gas absorption, add 2L of 4.0mol / L hydrochloric acid solution to 1#, heat to 75°C, and slowly add 5-15mL of 10wt% sodium chlorate solution dropwise, After reacting for 1 hour, most of the palladium was transferred to the solution to obtain a palladium-containing leaching solution, and a reducing agent (the addition of iron was 22g / L) was used to replace the obtained palladium-containing leaching solution, so as to reduce the palladium element in the leaching solution, and obtain the substituted leaching solution. liqu...

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Abstract

The invention discloses a method and system for treating a load type palladium-contained dead catalyst. A carrier of the load type dead catalyst is alpha-Al2O3 or SiO2-alpha-Al2O3. The method includes the steps that 1, the palladium-contained dead catalyst is calcinated; 2, the calcinated dead catalyst is leached, and the carrier and palladium-contained leachate are obtained; 3, exchange treatment is conducted on the palladium-contained leachate, exchanged liquid and first filter residues containing palladium are obtained, and most of the exchanged liquid is returned to be leached; 4, the other part of the exchanged liquid is filtered, and filtrate and second filter residues containing palladium are obtained; 5, the first filter residues containing palladium and the second filter residues containing palladium are refined, and palladium products are obtained. By the adoption of the method, the reagent use amount can be greatly reduced, reduction of the production process is achieved, and the recovery rate of palladium reaches up to 99% or above.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, in particular, the invention relates to a method and system for treating spent palladium-containing catalysts. Background technique [0002] Precious metals are rare resources, and the spent catalysts made from them play an irreplaceable role in the petrochemical industry. After long-term use, the spent catalyst gradually loses its activity due to the deposition of carbon-containing substances or the poisoning of various harmful impurities. separate. The precious metal waste catalysts currently used in industry are mainly based on alumina or silica as a carrier. With the development of industry and the shortage of resources, precious metals in spent catalysts, as precious secondary resources, have a very large recovery value. [0003] At present, most of the methods for recycling waste catalysts containing precious metals at home and abroad only recover the precious metals, but the c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B11/00
CPCY02P10/20
Inventor 夏军杨洪英傅建国易翔任娟殷书岩
Owner HOOTECH
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